1  /* locale information
       2  
       3     Copyright 2016-2023 Free Software Foundation, Inc.
       4  
       5     This program is free software; you can redistribute it and/or modify
       6     it under the terms of the GNU General Public License as published by
       7     the Free Software Foundation, either version 3, or (at your option)
       8     any later version.
       9  
      10     This program is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      13     GNU General Public License for more details.
      14  
      15     You should have received a copy of the GNU General Public License
      16     along with this program; if not, write to the Free Software
      17     Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
      18     02110-1301, USA.  */
      19  
      20  /* Written by Paul Eggert.  */
      21  
      22  #include <limits.h>
      23  #include <wchar.h>
      24  
      25  struct localeinfo
      26  {
      27    /* MB_CUR_MAX > 1.  */
      28    bool multibyte;
      29  
      30    /* The locale is simple, like the C locale.  These locales can be
      31       processed more efficiently, as they are single-byte, their native
      32       character set is in collating-sequence order, and they do not
      33       have multi-character collating elements.  */
      34    bool simple;
      35  
      36    /* The locale uses UTF-8.  */
      37    bool using_utf8;
      38  
      39    /* An array indexed by byte values B that contains 1 if B is a
      40       single-byte character, -1 if B is an encoding error, and -2 if B
      41       is the leading byte of a multibyte character that contains more
      42       than one byte.  */
      43    signed char sbclen[UCHAR_MAX + 1];
      44  
      45    /* An array indexed by byte values B that contains the corresponding
      46       wide character (if any) for B if sbclen[B] == 1.  WEOF means the
      47       byte is not a valid single-byte character, i.e., sbclen[B] == -1
      48       or -2.  */
      49    wint_t sbctowc[UCHAR_MAX + 1];
      50  };
      51  
      52  extern void init_localeinfo (struct localeinfo *);
      53  
      54  /* Maximum number of characters that can be the case-folded
      55     counterparts of a single character, not counting the character
      56     itself.  This is a generous upper bound.  */
      57  enum { CASE_FOLDED_BUFSIZE = 32 };
      58  
      59  extern int case_folded_counterparts (wint_t, wchar_t[CASE_FOLDED_BUFSIZE]);